Quantitative Fit Tests of Selected Respirators for Health Care Workers Caring for Patients with Confirmed or Suspected COVID-19
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Abstract
OBJECTIVES: The abrupt emergence of COVID-19 cases has raised demand for personal protective equipment (PPE). We compared fit factors of various masks and respirators available in healthcare settings in Thailand to assess suitability of sealed surgical mask or N95 respirator as an alternative to a surgical N95 respirator.
MATERIALS AND METHODS: A total of 31 quantitative respirator fit tests were performed among 3 masks and 5 respirators using PortaCount 8048, TSI Incorporated, Minnesota, USA, following Occupational Safety and Health Administration (OSHA) protocols.
RESULTS: Fit factors of two unsealed surgical masks were around 4 – 5. When they were sealed with 3M micropore tape, the fit factors increased to 33 – 38, which were below the OSHA criterion of 100. Fit factors of four unsealed masks and respirators were between 11 - 95, but after sealing, the fit factors increased to 199 and more. Two respirators passed the criterion of 100 without sealing.
CONCLUSIONS: Sealing of both masks and respirators improved fit factors substantively. Therefore, we recommend “always seal” masks and respirators particularly in the situation where an individual fit testing is not mandatorily required. To better protect healthcare workers caring for suspected or confirmed COVID-19 cases, it is advised that every healthcare worker should be trained on wearing an N95 respirator and go through a respirator fit test as part of respiratory protection program.
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References
2. National Center for Immunization and Respiratory Diseases. Using Personal Protective Equipment (PPE): NCIRD, Division of Viral Diseases; 2020 [Available from: https://www.cdc.gov/coronavirus/2019-ncov/hcp/using-ppe.html].
3. National Institute for Occupational Safety and Health. Understanding the Difference between Surgical Mask and N95 Respirator: Centers for Disease Control and Prevention; 2020 [Available from: https://www.cdc.gov/niosh/npptl/pdfs/UnderstandDifferenceInfographic-508.pdf].
4. Ministry of Public Health. Press release of Corona Virus Disease (COVID-19): Department of Disease control; 2020 [Available from: https://ddc.moph.go.th/viralpneumonia/eng/news.php].
5. TSI Incorporated. PORTACOUNT® model 8040 and 8048 Respirator fit testers 2019 [Available from: https://tsi.com/products/respirator-fit-testers/portacount-respirator-fit-tester-8048-kit/].
6. Fit Testing Procedures (Mandatory), 1910.134 App A. Sect. Subpart I Personal Protective Equipment (2020).
7. OSHA Respirator Medical Evaluation Questionnaire (Mandatory), 1910.134 App C. Sect. Subpart I Personal Protective Equipment (2020).
8. Lee S, Kim H, Lim T, Oh J, Kang H, Ahn C, et al. Simulated workplace protection factors for respirators with N95 or higher filters for health care providers in an emergency medical centre: A randomized crossover study. Hong Kong Journal of Emergency Medicine. 2017;24(6):282-9.
9. National Center for Immunization and Respiratory Diseases. Strategies for Optimizing the Supply of N95 Respirators: NCIRD, Division of Viral Diseases; 2020 [Available from: https://www.cdc.gov/coronavirus/2019-ncov/hcp/respirators-strategy/index.html].